US8362753B2 - Switching power supply circuit - Google Patents

Switching power supply circuit Download PDF

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Publication number
US8362753B2
US8362753B2 US12/728,269 US72826910A US8362753B2 US 8362753 B2 US8362753 B2 US 8362753B2 US 72826910 A US72826910 A US 72826910A US 8362753 B2 US8362753 B2 US 8362753B2
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terminal
voltage
voltage signal
power supply
supply circuit
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US20110062923A1 (en
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Jie-Jian Zheng
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Innocom Technology Shenzhen Co Ltd
Innolux Corp
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Innocom Technology Shenzhen Co Ltd
Chimei Innolux Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Definitions

  • the present disclosure relates to power supply circuit, and more particularly to a switching power supply circuit.
  • Switching power supply circuits are widely used in various electronic devices, such as liquid crystal display (LCD) monitors and televisions, for example.
  • LCD liquid crystal display
  • televisions for example.
  • a typical switching power supply circuit 100 includes a power circuit 110 , a switching circuit 101 and a load 130 .
  • the switching circuit 101 includes a power processing unit 120 , a voltage divider circuit 150 , a first filter circuit 160 , a second filter circuit 170 , and a capacitor C 863 .
  • the first filter circuit 160 , the power processing unit 120 , and the second filter circuit 170 are electrically connected in series.
  • the voltage divider circuit 150 includes a first resistor R 885 and a second resistor R 886 .
  • the first resistor R 885 and the second resistor R 886 are electrically connected in series between the load 130 and ground.
  • the power circuit 110 sends a DC voltage signal VDC to the first filter circuit 160 .
  • the first filter circuit 160 filters the voltage signal VDC to a stable signal VDC 1 , and sends the stable signal VDC 1 to an input terminal Vin of the power processing unit 120 .
  • An output terminal Vout of the power processing unit 120 outputs an output voltage signal VDC 2 .
  • the power processing unit 120 charges the capacitor C 863 , and the value of the output voltage signal VDC 2 is increased gradually to substantially equal the value of the voltage signal VDC.
  • the second filter circuit 170 filters the output voltage signal VDC 2 to a driving voltage signal VDO.
  • the driving voltage signal VDO is divided to generate a feedback voltage VDC 3 through the voltage divider circuit 150 , and the feedback voltage VDC 3 is input to a feedback terminal FB of the power processing unit 120 .
  • the power processing unit 120 compares the feedback voltage VDC 3 with a reference voltage Vref, if the feedback voltage VDC 3 exceeds the reference voltage Vref, the output voltage signal VDC 2 is forced into cutoff. If the feedback voltage VDC 3 is lower than the reference voltage Vref, the output voltage signal VDC 2 is forced into output.
  • the output voltage signal VDC 2 instantaneously changes from high to low or low to high, however, the change of the current of the output voltage signal VDC 2 is not instantaneous. During the gradual change of the current, the power of the output voltage signal VDC 2 is dissipated. When the change of the output voltage signal VDC 2 is at a high frequency, the power loss is more serious. The power dissipates in the form of heat, the circuit elements are easy to overheat and burn out.
  • FIG. 1 is a schematic diagram of a switching power supply circuit according to a first embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram of a switching power supply circuit according to a second embodiment of the present disclosure.
  • FIG. 3 is an exemplary waveform of an output terminal of a power processing unit shown in FIG. 1 and FIG. 2 .
  • FIG. 4 is a diagram of a conventional switching power supply circuit.
  • FIG. 1 shows a switching power supply circuit 200 according to a first embodiment of the present disclosure.
  • the switching power supply circuit 200 includes the power circuit 110 , a switching circuit 201 and the load 130 .
  • the power circuit 110 , the switching circuit 201 and the load 130 are electrically connected in series.
  • the switching circuit 201 includes a first filter module 260 , a second filter module 270 , a stability module 280 , the power processing unit 120 and the voltage divider circuit 150 .
  • the power processing unit 120 includes a ground.
  • the first filter module 260 includes a first inductor L 857 , a first capacitor C 873 , and a second capacitor C 856 .
  • the first inductor L 857 and the first capacitor C 873 are electrically connected in series between the power circuit 110 and the ground.
  • the first capacitor C 873 and the second capacitor C 856 are electrically connected in parallel.
  • the capacitance of the first capacitor C 873 is lower than the capacitance of the second capacitor C 856 .
  • the second filter module 270 includes a second inductor L 854 , a third capacitor C 871 , a fourth capacitor C 874 , a diode D 855 , a transformer 240 , and a fifth capacitor C 877 .
  • the diode D 855 can be a zener diode.
  • the second inductor L 854 , the third capacitor C 871 , and the diode D 855 constitute a loop.
  • the third capacitor C 871 and the fourth capacitor C 874 are electrically connected in parallel. The capacitance of the third capacitor C 871 exceeds the capacitance of the fourth capacitor C 874 .
  • the transformer 240 includes a primary winding and a secondary winding; the primary winding includes a first terminal S 1 and a second terminal S 2 , the secondary winding includes a third terminal S 3 and a fourth terminal S 4 .
  • the first terminal S 1 is electrically connected to the third capacitor C 871 .
  • the second terminal S 2 is electrically connected to an input terminal Vin 1 of the load 130 .
  • the third terminal S 3 and the fourth terminal S 4 are both electrically connected to the ground.
  • the fifth capacitor C 877 is electrically connected between the second terminal S 2 and the ground.
  • the stability module 280 includes a third inductor L 809 , a sixth capacitor C 863 and a third resistor R 853 .
  • the third inductor L 809 , the sixth capacitor C 863 and the third resistor R 853 are electrically connected in series between the output terminal Vout and the ground.
  • the first resistor R 885 is connected between the feedback terminal FB and the ground.
  • the second resistor R 886 is connected between the feedback terminal FB and the first terminal S 1 .
  • the power circuit 110 sends a DC voltage signal VDC to the first filter module 260 .
  • the first inductor L 857 stabilizes the current of the voltage signal VDC.
  • the first capacitor C 873 filters the high frequency noise of the voltage signal VDC, and the second capacitor C 856 filters the low frequency noise of the voltage signal VDC.
  • the first filter module 260 sends a stable first voltage signal VDB 1 to the input terminal Vin of the power processing unit 120 .
  • the output terminal Vout of the power processing unit 120 outputs a second voltage signal VDB 2 .
  • the stability module 280 receives the second voltage signal VDB 2 and outputs a third voltage signal VDB 3 .
  • the third inductor L 809 stabilizes the current of the stability module 280
  • the sixth capacitor C 863 stabilizes the voltage of the stability module 280
  • the third voltage signal VDB 3 is gradually increased.
  • the third voltage signal VDB 3 is filtered by the second filter module 270 , and converted to a fourth voltage signal VDB 4 .
  • the fourth voltage signal VDB 4 is gradually increased.
  • the transformer 240 receives the fourth voltage signal VDB 4 , and the fourth voltage signal VDB 4 is filtered by the primary winding and the fifth capacitor C 877 .
  • the second terminal S 2 sends a drive voltage VDO to the input terminal Vin 1 of the load 130 .
  • the fourth voltage signal VDB 4 is divided into a feedback voltage VDB 5 through the voltage divider circuit 150 .
  • the feedback voltage VDB 5 is input to the feedback terminal FB of the power processing unit 120 .
  • the power processing unit 120 compares the feedback voltage VDB 5 with a reference voltage Vref, the reference voltage Vref equaling or slightly lower than the value of the drive voltage VDO divided by the voltage divider circuit 150 . If the feedback voltage VDB 5 exceeds the reference voltage Vref, the second voltage signal VDB 2 is forced into cutoff as there is no voltage output from the output terminal Vout. If the feedback voltage VDB 5 is lower than the reference voltage Vref, the second voltage signal VDB 2 is forced into output. When the second voltage signal VDB 2 instantaneously changes from high to low, when current of the second voltage signal VDB 2 decreases, the power of the second voltage signal VDB 2 is stored in the third inductor L 809 and the sixth capacitor C 863 . The stored power can be released through the loop constituted by the second inductor L 854 , the third capacitor C 871 , and the diode D 855 .
  • a switching power supply circuit 300 differing from the power supply circuit 200 in that a second filter module 370 , the second inductor L 854 and the third capacitor C 871 are omitted; the fourth capacitor C 874 and the fifth capacitor C 877 are electrically connected in parallel; the third voltage signal VDB 3 is divided into a feedback voltage VDB 6 through the voltage divider circuit 150 ; and the stored power can be released through a loop constituted by the fifth capacitor C 877 , the transformer 240 , and the diode D 855 .
  • the power processing unit 120 According to comparison between the feedback voltage VDB 5 /VDB 6 and the reference voltage Vref, the power processing unit 120 generates a control voltage Vctrl. If the feedback voltage VDB 5 /VDB 6 is lower than the reference voltage Vref, the control voltage Vctrl is at low level (e.g., logical 0); if the feedback voltage VDB 5 /VDB 6 exceeds the reference voltage Vref, the control voltage Vctrl is at high level (e.g., logical 1).
  • the second voltage signal VDB 2 When the control voltage Vctrl changes from low to high, the second voltage signal VDB 2 instantaneously changes from high to low, creating an instantaneous low peak on the waveform of the current IDB 2 , and an instantaneous high peak on the waveform of a power PDB 2 .
  • the third inductor L 809 stabilizes the current IDB 2 and the power of the high peak is stored in the third inductor L 809 and the sixth capacitor C 863 .
  • the control voltage Vctrl changes from high to low the second voltage signal VDB 2 instantaneously changes from low to high, an instantaneous high peak is formed on the waveform of the current IDB 2 , and an instantaneous high peak is formed on the waveform of the power PDB 2 .
  • the third inductor L 809 stabilizes the current IDB 2 and the power of the high peak is stored in the third inductor L 809 and the sixth capacitor C 863 .
  • the power can be stored in the inductor and the capacitor and released through a loop.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Liquid Crystal Display Device Control (AREA)
US12/728,269 2009-09-17 2010-03-21 Switching power supply circuit Active 2031-07-28 US8362753B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN200910307137 2009-09-17
CN200910307137.0 2009-09-17
CN200910307137.0A CN102024404B (zh) 2009-09-17 2009-09-17 电源开关电路及液晶显示器电源系统

Publications (2)

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US20110062923A1 US20110062923A1 (en) 2011-03-17
US8362753B2 true US8362753B2 (en) 2013-01-29

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US12/728,269 Active 2031-07-28 US8362753B2 (en) 2009-09-17 2010-03-21 Switching power supply circuit

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CN (1) CN102024404B (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106856085A (zh) * 2016-12-31 2017-06-16 马鞍山格尚智能装备有限公司 一种户外大型显示屏画面稳定电路

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471378A (en) * 1992-06-23 1995-11-28 The University Of Toledo AC to DC converter system with ripple feedback circuit
US5491403A (en) * 1995-03-30 1996-02-13 Lin; Hui-Chi Alternative voltage stabilizer for improving transient response and increasing area of voltage stabilized
US6584000B1 (en) * 2002-01-18 2003-06-24 Ching-Chung Lee Electronic stabilizer
US20090140708A1 (en) * 2004-12-03 2009-06-04 Texas Instruments Incorporated DC to DC converter with Pseudo Constant Switching Frequency
US7598717B2 (en) * 2005-04-08 2009-10-06 Northrop Grumman Corporation Current-sourced power supplies
US20090284993A1 (en) * 2008-05-16 2009-11-19 Innocom Technology (Shenzhen) Co., Ltd. Switching power supply circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200969207Y (zh) * 2006-06-13 2007-10-31 咸阳华立电子设备有限公司 液晶显示屏一体化背光源驱动器
KR20070119160A (ko) * 2006-06-14 2007-12-20 엘지이노텍 주식회사 피디피 전원 장치
TWI342531B (en) * 2006-06-16 2011-05-21 Chimei Innolux Corp Power supply circuit
CN101398548B (zh) * 2007-09-28 2010-05-26 群康科技(深圳)有限公司 电源电路及液晶显示器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471378A (en) * 1992-06-23 1995-11-28 The University Of Toledo AC to DC converter system with ripple feedback circuit
US5491403A (en) * 1995-03-30 1996-02-13 Lin; Hui-Chi Alternative voltage stabilizer for improving transient response and increasing area of voltage stabilized
US6584000B1 (en) * 2002-01-18 2003-06-24 Ching-Chung Lee Electronic stabilizer
US20090140708A1 (en) * 2004-12-03 2009-06-04 Texas Instruments Incorporated DC to DC converter with Pseudo Constant Switching Frequency
US7598717B2 (en) * 2005-04-08 2009-10-06 Northrop Grumman Corporation Current-sourced power supplies
US20090284993A1 (en) * 2008-05-16 2009-11-19 Innocom Technology (Shenzhen) Co., Ltd. Switching power supply circuit

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Publication number Publication date
CN102024404A (zh) 2011-04-20
US20110062923A1 (en) 2011-03-17
CN102024404B (zh) 2013-01-16

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